add config property to save the additional configuration

Signed-off-by: Roland.Ma <rolandma@yunify.com>

config/gateway/templates/nginx-ingress.yaml

@@ -16,7 +16,9 @@ spec:
       enabled: {{ eq .Values.service.type "LoadBalancer" }}
 
     # Will add custom configuration options to Nginx https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/
-    config: {}
+    {{- if .Values.controller.config }}
+    config: {{ toYaml .Values.controller.config | nindent 6 }}
+    {{- end }}
 
     ## Annotations to be added to the controller config configuration configmap
     ##
@@ -256,7 +258,7 @@ spec:
       enabled: true
 
       serviceMonitor:
-        enabled: false
+        enabled: true
       prometheusRule:
         enabled: false